What are some alternatives?
When comparing NoBounce Email List Cleaner and Mail Dump, you can also consider the following products
Email Verifier - Email verifier app lets you verify email.
Hunter - Find all the email addresses related to a domain
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
Find That Email - The yellow pages of emails.
useBouncer - The most intelligent email checker, that lets you focus on valuable relationships! Verify email address with simple App or easy-to-integrate API.
MailDump Verifier - Powerful Emails Verifying Tool that helps verify email address or validate email addresses